/* ============================================
   修复1: 主导航栏居中
============================================ */
.main-nav {
    width: 100%;
}

.main-nav .container-fluid {
    display: flex;
    justify-content: center;
}

.main-nav .main-menu {
    display: flex;
    justify-content: center;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 30px;
}

.main-nav .menu-item {
    display: inline-flex;
}